As Clay (the person who runs this site) receives revenue and pays for this site by selling Japanese textbooks, I think asking for illegal copies of books on this site is kind of rude. Just my opinion, though. If you weren't asking for illegal copies, then forgive my chiding, I'm just jaded from too many whippersnappers who refuse to pay for things.

There are a number of actually free resources available on the net, but often they are websites (like this one) rather than full text books. There is a full free textbook on Japanese grammar available at http://www.nihongoresources.com, which was linked off the main page.